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3x(x+2)-7=2 3x²+6x-7=2 3x²+6x-9=0 3(x²+2x-3)=0 [Divide by 3] (x²+2x-3)=0 (x+3)(x-1)=0 x= -3 x=1

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 cas...

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 elimina...

Line 1: y = 2x + 2 Line 2: y = x² - 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...

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 equ...