3 years ago

If f(x)=x*−81 and g(x)=(x−9)−1(x+9), find g(x)×f(x).

1 answer:

7 0

F(x) = x²-81

g(x) = (x-9) -1(x+9)

= (x-9) -x-9

g(x) • f(x)

= [x²-81 ] • [ (x-9) -x-9 ]

=[ x²-81 ] • [ (x-x -9-9) ]
= [ x²-81 ] •[0-18]
= [ x²-81] •[ -18]

= -18•x² +-81•-18
= -18x²+1458

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Solve to find the value of x.

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Answer:

x=12

Step-by-step explanation:

We know that a right angle is 90 degrees. So we can make the equation $35+4x+7=90.$ Now, we can solve fore X! We can combine 35 and 7 to make the equation $4x+42=90$ . In order to isolate x we have to subtract 42 from both sides, getting us the equation $4x=48.$ Now, in order to isolate x we must divide each side by 4, getting us the equation $12=x$ . To prove that x=12, we can subsitute x for 12. This means that we can do $35+4(12)+7=90. Or, 35+48+7 =90,$ which simplified, is 90=90, making x=12 true. Hope this helps :)