perplexus.info :: Just Math : Find the value of a

Find the value of a (Posted on 2024-09-18)

Given that:
F(x) = x²+10x, and:
F(F(a)) = 11

Find the value of a.

No Solution Yet Submitted by K Sengupta

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Two-stepping it

Comment 2 of 2 |

Let y = F(a)

Then y^2 + 10y = 11

Solutions are 1 and -11

Use quadratic formula to solve both x^2 + 10x = 1

and x^2 + 10x = -11

Results are the same as Larry's

Posted by Steve Herman on 2024-09-18 14:27:48

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