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Simplify and then solve by factorisation 3x(x+2)-7=2, to find x.

3x(x+2)-7=2 3x 2 +6x-7=2 3x 2 +6x-9=0 3(x 2 +2x-3)=0 [Divide by 3] (x 2 +2x-3)=0 (x+3)(x-1)=0 x= -3 x=1
IM
Answered by India M. • Maths tutor
7047 Views

Differentiate y = 3x^4 + 6x^3

There are two really simple steps we can use to be able to differentiate in a question like this. The first step is to multiply the number in the power by the number in front of the variable - in this case t...
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Answered by Amrita B. • Maths tutor
5492 Views

Denise buys 5 apples and 3 bananas for £3.15. A banana costs 25p more than an apple. How much would it cost to buy 4 apples and 2 bananas?

Apple costs: 30pBanana costs: 55pFinal Answer: £2.30Answer should be calculated by first interpreting the question to form two simultaneous equations. These can be solved by either substitution or eliminatio...
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Answered by Greg S. • Maths tutor
6287 Views

Finding the intersection of a two lines (curved and linear example)

Line 1: y = 2x + 2 Line 2: y = x 2 - 1Firstly, intersection of two lines is the point at where the coordinates of both lines are the same. X1 = X2 and Y1 = Y2Therefore, that means we can exploit that fact an...
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Answered by Fabio F. • Maths tutor
4011 Views

How do I use the discriminant in circle geometry?

Where does the discriminant come from? It is from the quadratic formula. It is the part under the square root sign, in other words it can't be negative or there are no real solutions to your quadratic equati...
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Answered by Jonathan S. • Maths tutor
12170 Views