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Factorise x^2 + 3x -28

[Method 1] The solutions need to add together to make 3 and multiply to make -28. For them to multiply and make a negative number one of the solutions must also be negative and the other positive (so there a...
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Answered by Austin D. • Maths tutor
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Expand 5a(a+3b)

5a x a = 5a 2 5a x 3b =15ab 5a 2 + 15ab
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Answered by Mahnoor K. • Maths tutor
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If f(x) = 2x+5, g(x) = 8x-7 and f(x)=g(x). Find the value of x. Show your working.

f(x) = g(x), 2x+5=8x-7, 12=6x, 6x=12 therefore, x=2.
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Answered by Natalie R. • Maths tutor
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What is the best way to prepare to sit my exams?

I found that the best way to prepare was by looking at past exam questions and attempting them under exam conditions - timed, in silence, and without notes. It can also be useful to look over worksheets that...
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Answered by Tegan C. • Maths tutor
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Factorise x^2 −x−12

To factorise you need to look at common factors. And it needs to be put into the expression (x+/- y)(x+/- v)For X 2 -X-12, you need two numbers that times to make -12 and add to make -1-1X12, -12X1, -6X2, -2...
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Answered by Lauryn P. • Maths tutor
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