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Derive X^2 + 2x

2x + 2
SK
Answered by Sam K. • Maths tutor
4053 Views

expand and simplify 2(c+5)+5(c-7)

Firstly, it is best to expand the brackets to get:2c+10+5c-35 (be mindful of the signs inside and outside the bracket because you might get a double minus sign that results in a +, however that is not the ca...
MV
Answered by Mansi V. • Maths tutor
4682 Views

Tony buys 12 apples and 7 pears for £10.90. An apple costs 20p less than a pear. What would be the cost of 4 apple and 9 pears?

Let's call an apple 'a', and a pear 'p'.If Tony bought 12 apples and 7 pears for £10.90, then we can write the following equation:12a + 7p = 10.9If an apple costs 20p less than a pear, we can say:a = p - 0.2...
RJ
Answered by Rupert J. • Maths tutor
4851 Views

Rationalise the denominator of 2/(3-sqrt(2)).

First, rationalise the denominator by multiplying the top and bottom of the fraction by the conjugate of the denominator.(2/(3-sqrt(2))) ((3+sqrt(2))/(3+sqrt(2)))Next, expand the brackets - notice there will...
SA
Answered by Sophia A. • Maths tutor
7258 Views

What is (x-5)^2

Separate the square: (x-5) 2 = (x-5)(x-5)multiply the variables: x 2 multiply the numbers: -5 x -5 = 25multiply a variable and a number: -5xtimes this value by two: -10xsum all answers: x 2 - 10x + 25
MB
Answered by Matthew B. • Maths tutor
5189 Views