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Find x: 4x + 7 = 27

4x + 7 = 27 4x = 20 x = 5

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To solve this equation we need to expand the right hand side to get: x^2 = 4(x^2-6x+9), then we multiply whats in the bracket by 4 to get: x^2 = 4x^2 - 24x +36. We can subtract x^2 from both sides to give...

Answered by Kelsi F. • Maths tutor

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Solve 5x-2=3x+11

5x-2=3x+11

Move the (-2) to the right handside. As it crosses over the (-) becomes a (+)

5x=3x + (11+2)

Move the (+3x) to the left handside. As it crosses over the (-) becomes a (+)

Answered by Tom F. • Maths tutor

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Re-arrange (3x+y)/2 = x+z making x the subject.

To make x the subject we want to try to get all the x's on one side of the equals sign! Firstly to get rid of the fraction we multiply both sides by 2, giving 3x+y= 2(x+z). We then expand the brackets on ...

Answered by Lara M. • Maths tutor

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