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If 3x^2 = 48 find x

3x^2 = 48 x^2 = 16 x = 4

Answered by Frankie L. • Maths tutor

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Solve the equations x^2+y^2=13 and x-2y=1 simultaneously.

a)By completing the square, prove the quadratic formula starting from ax^2+bx+c=0, b) hence, or otherwise solve 3x^2 + 7x -2= 9, to 3s.f.

ABCD is a regular paralleogram, A=(2,1) B=(7,2) and C=(4,6), work out the gradient of the line CD and then work out the area of ABCD.

2x^2 - 16x + 32

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