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Complete the square for the quadratic expression x^2 − 8x + 7

As the coefficient (the number before) of x² is 1 we can start the expression with (x...The coefficient of x is -8 so we half this to complete the brackets and form (x-4)²...Next the...

Answered by Megan B. • Maths tutor

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How do I expand single brackets?

tt the brafckTo expand any brackets, simple or double the golden rule to remember is you must multiply everything inside the bracket by everything outside the bracket. Let's run through some examples:2(x+...

Answered by Tutor122756 D. • Maths tutor

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Billy wants to buy these tickets for a show. 4 adult tickets at £15 each 2 child tickets at £10 each A 10% booking fee is added to the ticket price. 3% is then added for paying by credit card. Work out the total charge when paying by credit card.

4 x 15 = 602 x 10 = 2060 + 20 = 8080 + 8 (10%) = 883% of 88 =1%: 0.880.88 * 3 = 2.6488 + 2.64 = £90.64

Answered by Nighat K. • Maths tutor

8565 Views

Show that (x+2)(x+3)(x+4) can be written in the form of ax^3+bx^2+cx+d where a, b, c and d are positive integers.

This is a 'show that' question which means that you need to prove that something is true. This question wants you to rewrite (x+2)(x+3)(x+4) into the form of ax^3+bx^2+cx+d. To do this, we have to expand ...

Answered by Alicia H. • Maths tutor

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In a bag of balls, 3 are red, 2 are blue and 5 are green. Two balls are selected from the bag. Calculate the probability that both are green.

Answer:2/9On the first pick of the bag, there are 10 balls in total. Out of these balls, 5 are green. Therefore the probability of picking a green ball will be 5/10 or 1/2. On the second pick of the bag, ...

Answered by Charlie H. • Maths tutor

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