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Expand and simplify x(x+4)(x-5)

Apply FOIL (First, outside, inside, last): (x + 4)(x - 5) = x 2 - 5x + 4x -20 = x 2 - x -20 x(x + 4)(x - 5) = x( x 2 - x -20 ) = x 3 - x 2 - 20x
JS
Answered by James S. • Maths tutor
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Explain why the points (0,8) do not lie on the line y= 4x+9 ? (3 marks)

To see if (0,8) lies on the line y, substitute 0 (the x coordinate) into y = 4x+9 so y=4(0)+9 y=4(0)+9 therefore y= 0+9 = 9since the output (9) is not the same as the respective coordinate (8), (0,8) does no...
RL
Answered by Rinaldo L. • Maths tutor
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How do you solve a quadratic equation?

For example x 2 - 2x - 35 = 0You would have two approaches to this question. You can either use the quadratic formula or you could simplify the expression. Using the formula you would have x = (2+or- (4-4x1x...
BT
Answered by Bianka T. • Maths tutor
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Workout 2 1/7 + 1 1/4

Question: 2 1/7 + 1 1/4. Step 1: Rewrite the calculation to simplify (Combine integers) = 2+1+(1/7)+(1/4)=3+(1/7)+(1/4) Step 2: Find the lowest common factor of 4 and 74 8 12 16 20 24. 28 7 14 21 28 Step 3: ...
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Answered by Sam S. • Maths tutor
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x^2 - y = 14, y - 2 = 6x, solve these equations simultaneously

Make y the sbject of the second eqautiom y=6x+2. substitute this for the y in the first equation.the first equation now looks like x 2 -(6x+2)=14. Open the brackets and subtract 14 from both sides. x 2 -6x-1...
JP
Answered by Jai P. • Maths tutor
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