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 ▸Find ∫(4x - 2/(x^3)) dx
What is a major use of completing the square?
A table has diameter 130cm. What is the area, as a multiple of Pi
a) A line passes through (0,9) and (3,12) write down the equation of this line . b) A line perpendicular to the line in part a passes through the point (3,14) write the equation of this line.)