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First, you need to factorise the quadratic:x2-3x-4=0(x-4)(x+1)=0Then, set each of the brackets to equal 0 and solve for x:x-4=0 --> x = 4x+1=0 --> x=-1
We factorise the equation by completing the square.Take y=x2 + ax + bWhen we complete the square we have y= (x+1/2a)2-a2+b which is y= (x+1/2a)2 + c where c = -...
The two common ways to approach them is either by substitution or addition/subtraction. Firstly, for substitution, rearrange one of your equation so that one of the unknowns becomes the subject and then ...
Rearrange to make the y component the subject3y = 19 - 2x , y = 11 - 3xMultiply the second equation by 33y = 33 - 9xEquate to each other19 - 2x = 33 - 9xRearrange7x = 14Divide by 7x = 2Substitute x=2 into...
(x + 2)^2 + 14. a = 2, b = 14
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