Question

Evaluate √63− 4√7. i need help asap

Answer 1

Answer:
`-√(7)`

Negative square root of 7, or in shorthand, -sqrt(7)

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Step-by-step explanation:

Let's first simplify
`√(63)`

Note how 63 = 9*7, and 9 is the largest perfect square factor. This is to help simplify the root as such:

`√(63) = √(9*7)\\\\√(63) = √(9)*√(7)\\\\√(63) = 3√(7)`

Therefore, we can say,

`√(63)-4√(7)\\\\3√(7)-4√(7)\\\\(3-4)√(7)\\\\-1*√(7)\\\\-√(7)\\\\`

If you want, you can think of
`x = √(7)` to get

`3√(7)-4√(7) = 3x-4x = -1x = -√(7)\\\\`