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 ▸If a curve has equation y=(4/3)x^3-2x^2-24x+16, find dy/dx and find the coordinates of the turning points.
p and q are two numbers each greater than zero. √(p^2 + 5q) = 8 and √(p^2 – 3q) = 6. Find the values of p and q.
Rationalise the denominator of 14 / 2 + root3
f(x)=cos(x), g(x)=2+cos(x-1), state g(x) as a vector applied to f(x)