49^2-9=0
b^2-5b=0
a^2-9a+20
0=v(v+4)
2007-10-22 07:13:57 · 10 answers · asked by Belki C 2 in Science & Mathematics ➔ Mathematics
49^2-9=0 is not true.
b^2-5b=0
b(b-5)=0
b=0 or b-5=0
b=0 or b=5
a^2-9+20
(a-4)(a-5)
0=v(v+4)
v=0 or v+4=0
v=0 or v=-4
2007-10-22 07:20:04 · answer #1 · answered by yoo 2 · 0⤊ 0⤋
49^2-9=0
49^2 -9 not equal 0
b^2-5b=0
b(b-5)=0
b = 0 or b = 5
a^2-9a+20 = (a-5)(a-4)
0=v(v+4)
v= 0 or v = -4
2007-10-22 07:20:40 · answer #2 · answered by ironduke8159 7 · 0⤊ 0⤋
the first one can not be worked out partly because there are no variables in it like the others and the equation is not balanced.... 2392 = 0 this can not work...
b^2 - 5b = 0.... factor out a b
b(b - 5) = 0... now that you have 2 terms set each to 0
b = 0... this one is done....
b - 5 = 0 ... add 5 to both sides
b = 5 ... now this one is done
a^2 - 9a +20 can be factored to....
(a - 4)(a - 5) set eact to 0
a - 4 = 0 ... add 4 to both sides...
a = 4... this one is done
a - 5 = 0... add 5 to both sides....
a = 5 ... this one is done
0 = y(y + 4) ... set each to 0
y = 0 .... this one is done....
y + 4 = 0 ... subtract 4 from each side
y = -4 ... this one is done
2007-10-22 07:24:43 · answer #3 · answered by Richard B 3 · 0⤊ 0⤋
49x^2-9=0
(7x-3)(7x+3)=0
x=-3/7; 3/7
b^2-5b=0
b(b-5)=0
b=0 b=5
a^2-9a+20=0
(a-4)(a-5)=0
a=4 , a=5
0=v(v+4)
v=0 or-4
2007-10-22 07:21:09 · answer #4 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋
huh? do you mean solve for the unknown variables? Well the first problem doesnt really make sense to me since 49^2 - 9 does NOT equal 0.
2007-10-22 07:17:59 · answer #5 · answered by Marco 2 · 0⤊ 0⤋
first one is not equal. bc 7 does not equal 3.
b is either 0, or 5 both of them are right answers
(a-4)(a-5) for third, bc -4, -5 comes to +20
v=0 and v=-4
2007-10-22 07:22:04 · answer #6 · answered by Jimmy 1 · 0⤊ 0⤋
you need some parenthesys in there =/
its pretty weird without them we don't
know wut you mean by:
49^2-9=0
is it 49^(2)-9
or 49^(2-9)=0
sam with the other ones =/
2007-10-22 07:21:22 · answer #7 · answered by BookMartian 3 · 0⤊ 0⤋
just use a scienfitic calculator- easy
2007-10-22 07:17:25 · answer #8 · answered by Sijaar Ahmed 1 · 0⤊ 0⤋
Huh Thts Confusin !!!!!!!!!!!!!!!
2007-10-22 07:16:46 · answer #9 · answered by F S 1 · 0⤊ 0⤋
I don't. You do.
2007-10-22 07:16:41 · answer #10 · answered by tharnpfeffa 6 · 0⤊ 0⤋