book Maths Puzzle Numerical Ability

Can someone help me solve this for X
sqrtx+7 = x+1

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book Other Question

fing the roots of the equestion:x^2+4x+8?
1.fing the roots by using compliting the squar method?
2.fing the roots by using factorisation method?
3.fing the roots by usin graphic The lengh of a rectangle is represented by (x-6) and the width of the rectangle is represented by (x+2). Express the area of this rectangle as a binomial in terms of x.