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Chapter 1: Q. 67 (page 24)

If (a,4)is a point on the graph of y=x2+3x, what is a?

Short Answer

Expert verified

The value ofais-4or1.

Step by step solution

01

Given information

The given point is a,4.

The given equation isy=x2+3x.

02

Determine the value of a

Substitute afor x, 4for yin y=x2+3x.

4=a2+3aa2+3a-4=0a2+4a-a-4=0aa+4-1a+4=0a-1a+4=0a=-4,1

03

Write the conclusion

The value ofais-4or1.

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x+1=4
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