Please help me with this:3a^2-75?

Answer 1

are you factoring? if so factor out GCF 1st which is 3 ...so you have 3(x^2-25) which is the difference of two squares factoring pattern...so (x^2-25 ) factors to (x+5) (x-5)
... so final answer is 3(x+5)(x-5)

Answer 2

The solution to the problem is

3a^2 - 75

= 3(a^2 - 25)

= 3[(a + 5) * (a - 5)]

Answer 3

if you're factoring then yes, you can go by what the others say
if you're trying to solve 'a' then it's pretty simple

3a^2 - 75

3a^2 = 75 <--- move 75 to the other side of the = sign

(3a^2)/3 = 75/3 <-- divide the three out

a^2 = 25
**Find the square root of 25 to cancel out the square on 'a'
a = +5, -5

Answer 4

3a^2 - 75 = 3(a^2 - 25) = 3(a - 5)(a + 5)