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developper et reduire  7-5(2x+1)-(8-4x)(2x+9)

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7-5(2x+1)-(8-4x)(2x+9)
7-10x-5-(16x+72-8x²-36x)
7-10x-5-16x-72+8x²+36x
8x²+10x-70
= 7 -5 ( 2x + 1 ) - ( 8 - 4x ) ( 2x + 9 )
= 7 - 10x - 5 - ( 16x + 72 - [tex] 8x^{2} [/tex] - 36x)
= 7 - 10x - 5 - 16x- 72 + [tex] 8x^{2} [/tex] + 36x
= [tex]8x^{2} [/tex] + 10x - 70




= 7-5(2x+1)-(8-4x)(2x+9)
= 7 - 5 * 2x + 5 * 1 - 8 * 2x + 8 * 9 + (-4x) * 2x + (-4x) * 9
= 7 - 10x + 5 - 16x + 72 + [tex] (-8x^{2}) [/tex] + (-36x)
= 79 - 62x + [tex]( -8x^{2} )[/tex]