Help with algebra please (30 points)

asked Apr 11, 2019 120k views

3 votes

5.2k points

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3 votes

The correct answer is a = 4

Wawy answered Apr 12, 2019

by Wawy

5.0k points

2 votes

$Q6.\\v(x)=x^2-20\\\\v(x+4)=(x+4)^2-20=x^2+2(x)(4)+4^2-20\\=x^2+8x+16-20=x^2+8x-4$

TRUE

$Q7.\\c(x)=5x^2+12x,\ d(x)=7x+5x^2\\\\c(x)-d(x)=(5x^2+12x)-(7x+5x^2)=5x^2+12x-7x-5x^2\\\\=(5x^2-5x^2)+(12x-7x)=5x$

$Q8.\\f(x)=6x+1,\ f(a)=25\\\\f(a)=6a+1\\\\\text{substitute}\\\\6a+1=25\qquad|-1\\\\6a=24\qquad|:6\\\\a=4$

Virantporwal answered Apr 15, 2019

5.6k points

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