factorise by using identities or regrouping..
a. x³ + 7x² - 78x
b. 2x² - 32x + 128
help me guys...
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Step-by-step explanation:
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Step-by-step explanation:
a) x³ + 7x² - 78x
= x ( x² + 7x - 78 )
= x [ x² + 13x - 6x - 78 ]
= x [ x ( x + 13 ) - 6 ( x + 13 ) ]
= x ( x 6 ) ( x + 13 ) is the answer.
b) 2x² - 32x + 128
= 2x² - 16x - 16x + 128
= 2x ( x - 8 ) - 16 ( x - 8 )
= ( x - 8 ) ( 2x - 16 ) is the answer.
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