Bonsoir,
a)2x(x+5)
= 2x² + 10x
b)(2-x)(x-6)
= 2x - 12 - x² + 6x
= - x² + 8x - 12
c)(2-6x)(3x-5)
= 6x - 10 - 18x² + 30x
= - 18x² + 36x - 10
d)(7+7x)(6x-12)
= 42x - 84 + 42x² - 84x
= 42x² - 42x - 84.
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Bonsoir,
a)2x(x+5)
= 2x² + 10x
b)(2-x)(x-6)
= 2x - 12 - x² + 6x
= - x² + 8x - 12
c)(2-6x)(3x-5)
= 6x - 10 - 18x² + 30x
= - 18x² + 36x - 10
d)(7+7x)(6x-12)
= 42x - 84 + 42x² - 84x
= 42x² - 42x - 84.