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Solve the inequality 5x - 7 > 2x +5

What does this inequality sign mean? That A "is greater than" B. We can treat inequalities as if they are = signs as long as we don't multiply or divide by negative numbers. What would happen then?...
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Answered by Camilla C. • Maths tutor
9372 Views

how do i calcualte the length of an unknown side of a right angled triangle

To calculate the length of the unknown side you must know the lenght of two of the other sides of the right angled triangle. if we know this we can use pythagoros thereom. The equation for this is a^2+b^2=c^...
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Answered by Callum L. • Maths tutor
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If f(x) = x^2 - 3x + 2, find f'(x) and f''(x)

f'(x) is the first derivative of f(x) therefore f'(x) = 2x - 3 To find f''(x) simply take the derivative of f'(x), therefore f''(x) = 2
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Answered by Peter O. • Maths tutor
5223 Views

Solve the simultaneous equations 3x + 2y = 4 and 4x + 5y = 17

3x + 2y = 4 (equation 1) 4x + 5y = 17 (equation 2) Multiply equation 1 by 2.5, giving 7.5x + 5y = 10 (equation 1) 4x + 5y = 17 (equation 2) Subtract equation 2 from equation 1, giving 3.5x = -7 Therefore, x ...
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Answered by Isabella G. • Maths tutor
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Factorise the following expression: x^2-1

(x+1)(x-1)
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Answered by Nelson T. • Maths tutor
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