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Please expand this equation and simplify: (2x + 5)(9x -4)

There are 4 multiplication equations that need to be done:1) (2x) x (9x) = 18x 2 2) (2x) x (-4) = -8x3) (5) x (9x) = 45x4) (5) x (-4) = -20Write this out as an equation: 18x 2 - 8x + 45x - 20 This simplified...
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Answered by Lizkerry O. • Maths tutor
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Find the roots of the quadratic equation 2x^2 - 15x - 8

First we have to multiply 8 and 2 together to get 16. We then need to find all the factors for this number.These are:1 and 162 and 84 and 4 From these sets of factors, we have to find which has a difference ...
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Answered by Siobhan G. • Maths tutor
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Find the coordinates of the turning point of the equation y =x^2-8x+10

We know that the turning point of this quadratic will be a minimum point because the coefficient of x2 is positive (1). To find the turning point, we must complete the square: y= (x-4) 2 -16 +10 so y= (x-4) ...
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Answered by Sita R. • Maths tutor
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The length of a rectangle is five times the width. The area of the rectangle is 1620cm2. Work out the width of the rectangle.

For this question, we need to know the formula for finding the area of a rectangle is (length * width)From the question, Width = w; Length = 5wArea = 5w *w =1620cm 2 . therefore, 5w 2 = 1620cm 2 . Divide bot...
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Answered by Eme H. • Maths tutor
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Multiply out and simplify (x+7)(x-3)

Using FOIL (First, Outside, Inside, Last), we get:F: x 2 O: -3xI: 7xL: -21Adding these together gives x 2 + (-3x) + 7x + (-21)Which is the same as x 2 - 3x + 7x - 21Which simplifies to x 2 + 4x - 21
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Answered by Glen R. • Maths tutor
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