Solve the equation "x^2 + 3x - 4 = 0".
Recognise that quadratic can be factorised:
(x+4)(x-1)=0
This gives the solutions x=-4 and x=1 by inspection.
ZK
Related Maths GCSE answers
All answers ▸The equation of the line L1 is y = 3x – 2 The equation of the line L2 is 3y – 9x + 5 = 0 Show that these two lines are parallel.
Solve the following simultaneous equations: 3x+y-2z = -2, y+4z = 1, 10x+2y+5z=26
By completing the square, find the coordinates of the turning point of the curve with equation y = x^2 + 10x + 2
Differentiate the following: 7x^2 - 3x^3 + 5 + 27x