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How do I expand and simplify a double bracket equation?

For example: 3(2a + 5) + 5(a - 2) The key is to approach this question in two steps, with the first step being to expand the brackets before then simplifying where possible. A good method for expanding the b...
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Answered by Sonu B. • Maths tutor
8147 Views

Find the roots for the quadratic equation x^2 +2x-3 = 0

I would show the student two methods of solving this answer.The first method by:Finding two numbers that multiply to make -3 and simultaneously add to make +2.The two numbers that satisfy this is +3 and -1. ...
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Answered by Adibah N. • Maths tutor
10554 Views

Triangle ABC has perimeter 20 cm. AB = 7 cm. BC = 4 cm. By calculation, deduce whether triangle ABC is a right-angled triangle. 4 marks.

We know that the perimeter of the triangle is 20cm and we also know the value of two of the sides of the triangle, AB=7cm and BC=4cm. We can work out the length of the third side (AC) by subtracting the know...
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Answered by Charlotte M. • Maths tutor
22387 Views

If x:y = 7:4 and x+y = 88 , work out the value of x–y.

We know that x:y is 7:4, and therefore x is seven-elevenths of the total value of x and y. Therefore we can express x = 7/11 (x+y). Since we also know that the total of x+y is 88, we can substitute this into...
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Answered by Reece S. • Maths tutor
12550 Views

Factorise the following: 21x(squared)-35x

The question is asking us to factorise, this means put the equation into a simplified bracket. The first step is to find the highest common factor (HCF), the HCF must be a factor of 21x 2 as well as -35x. I ...
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Answered by Annesa M. • Maths tutor
5427 Views