# Solve the equation? Please help solve?

√(x+7+5)=x

### 6 Answers

- mizooLv 77 years agoBest Answer
√(x + 12) = x ..... we know x ≥ 0

x + 12 = x^2

x^2 - x - 12 = 0

(x - 4)(x + 3) = 0

x = -3, 4

Since -3 is not in the domain

==> x = 4

- DouglasLv 77 years ago
√(x+7+5)=x square both sides

x+7+5=x^2 set up in quadratic equation format

x^2 -x -12 = 0 factor tow numbers, where their SUM is -1 and their PRODUCT is -12

(x-4)(x+3) = 0 two solutions

x = 4

or

x = -3

- 7 years ago
Square both sides to get x+7+5=x2

Put the x's on one side so you get 7+5=X2+x

So 12= x2-x

So x=4 because 4 sqaured is 16, 16-4 is 12

- 7 years ago
x^2 = x+7+5

x^2 = 12+x

if you use logic, from 1 to 9 the only one that can make x^2 = 12 + x is 4. becase if you 4^2 = 12+4 it is the truth. so the answer is 4

ps. sorry my english is weird

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- patrikLv 43 years ago
3t + a million < t + 12 (subtract t from the two factors) 2t + a million < 12 (subtract a million from the two factors) 2t < 11 (divide the two factors with the help of employing 2) t < 11/2 the biggest complete type value of t that satisfies the inequality is 5.