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Solve 9x +1> 2x +3

9x - 2x> 3-17x > 2x > 2/7
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Answered by Suruthi G. • Maths tutor
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You are told that y is proportional to x^2 and that y=75, x=5. Find a formula for y in terms of x.

You know that y is proportional to x 2 , so let y=kx 2 . You also know that y=75 and x=5. Substitute y=75 and x=5 into the equation y=kx 2 . Therefore: 75=k multiplied by 5 2 . 75=25k. 75/25=k. k=3. Put k ba...
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Answered by Anna G. • Maths tutor
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How do I find the maxima and minima of f(x) = e^(x^2)?

When dealing with maxima and minima points, there are two ways to go, one of these is to first compute the first derivative of the function, check when this function is zero, and then study its sign; the oth...
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Answered by Jacob A. • Maths tutor
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Q4 on 2017 Edexcel C4 paper, concerns differentiation of multiple variables.

(a) Asks to differentiate an equation C: 4x 2 - y 3 - 4xy + 2 y = 0Then use the fact that point P (-2,4), lies on C to find an expression for dy/dx Differential of form 8x - 3y 2 (dy/dx) - (4y + 4x(dy/dx)) +...
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Answered by Alexander W. • Maths tutor
3739 Views

7x + 6 > 1 + 2x

In order to solve this, we need to bring all of the x values to one side, we can do this by subtracting the 2x from both sides7x + 6 - 2x > 1 + 2x - 2x5x + 6 > 1 We then need to move the values onto th...
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Answered by Mala P. • Maths tutor
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