True or False? x2 – x – 56 = (x + 7)(x – 8)?
True or False? x2 – x – 56 = (x + 7)(x – 8)?
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Use FOIL to see if it’s true or not…
First: x * x
Outside: x * -8
Inside: 7x
Last: 7 * -8
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True, x+7 and x-8 are the factors of x2-x-56
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True, if you multiply (x +7)(x – 8) using the foil method you will get x^2 – x – 56/
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It’s true
LHS = x2-x-56
RHS = (x+7)(x-8)
= x(x-8)+7(x-8)
= x2-8x+7x-56
=x2-x-56= LHS
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Cmon Kid, make an effort to struggle a bit..How else will ya learn? This question can’t be all that intimidating…. Instead of factoring the left hand side, you can expand the right side (like what the other smart girl has done) and see for yourself whether its an identity..
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True. It’s all true, so very true. Wonderfully and truthfully true, yes.
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true.
If you expand the right side, you’ll find it’s true.
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