Expand and simplify (x + 6)^2 - (x + 4)(x - 7)?
回答 (5)
2008-01-07 11:57 am
✔ 最佳答案
x² + 12x + 36 - (x² - 3x - 28)15x + 64
2008-01-11 1:38 pm
Use perfect square and FOIL to expand and combine like terms.
Ans: 15x+64
Ans: 15x+64
2008-01-07 7:51 pm
=x^2+12x+36-x^2+3x+28
=15x+64
=15x+64
2008-01-07 7:55 pm
Take one component at a time...
(x+6)^2
(x+6)(x+6)
x^2 + 12x + 36
(x+4)(x-7)
x^2 - 3x - 28
(x^2 +12x +36) - (x^2 - 3x - 28)
x^2 + 12x + 36 - x^2 + 3x +28
15x + 64
(x+6)^2
(x+6)(x+6)
x^2 + 12x + 36
(x+4)(x-7)
x^2 - 3x - 28
(x^2 +12x +36) - (x^2 - 3x - 28)
x^2 + 12x + 36 - x^2 + 3x +28
15x + 64
2008-01-07 7:52 pm
(x + 6)^2 - (x + 4)(x - 7)
= x^2 + 12x + 36 -- x^2 + 3x + 28
= 15x + 64
= x^2 + 12x + 36 -- x^2 + 3x + 28
= 15x + 64
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