Y^2-24-23y
Please explain, also.
2007-07-10 07:45:06 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
y^2 - 23y - 24
= (y - 24)(y + 1)
2007-07-14 07:06:58 · answer #1 · answered by Anonymous · 1⤊ 0⤋
y^2 - 23y - 24 can be factored as
y + 1 and y - 24
Look at the possible factors of 24 (24 and 1, 12 and 2, 6 and 4, 8 and 3 etc.) and see which of them come close to 23.
2007-07-10 07:51:19 · answer #2 · answered by Swamy 7 · 0⤊ 0⤋
ax^2 + bx + c can be factorised by inspection only if the discriminant b^2 - 4ac is a perfect square.
Y^2-24-23y
= y^2 - 23y - 24
The discriminant is (-23)^2 - 4(-24)(1)
= 529 + 96
= 625
= 25^2.
The quadratic can therefore be factorised:
(y + 1)(y - 24).
2007-07-10 07:55:30 · answer #3 · answered by Anonymous · 0⤊ 0⤋
y^2 - 23y - 24 = (y - 24)(y + 1)
2007-07-10 07:50:08 · answer #4 · answered by pki15 4 · 0⤊ 0⤋