Solve x^2 + 15x = - 50
-
x2 + 15 x + 50 = 0 (rearrange by adding 50 to both sides)
-
(x + 10)(x + 5) = 0 (factorise the quadratic equation)
-
x + 10 = 0 or x + 5 = 0 (for the above to equal zero, at least one of the bracketed terms must equal zero)
-
x = -10 or x = -5 (solving the two equations that result from step 3)
-
The solution is x = -10, x = -5
JS
Related Maths GCSE answers
All answers ▸How do I solve simultaenous equations? e.g. 2x -5y =11 and 3x+2y=7
Maths A Level: "Sketch the curve of the function f(x) = 2x^3 - 2x - 12 and show that the equation f(x)=0 has one root; calculate the root."
x^2 +y^2 =25, y – 3x = 13 - Simultaneous Equations (June 2017)
Solve the equation (2x-1)/3 + (x+2)/2 +x/6 = 8