Question

factorise the following using formulae​

Answer 1

Answer:

To factorise a quadratic we have to go from an expression such as x2 − 2x − 15 to the linear factors (x − 5)(x + 3) which generate it when multiplied out. ... For example, the quadratic x2 − 2x − 15 has A = 1, B = −2 and C = −15. So according to the formula the solutions of the equation x2 − 2x − 15 = 0 are: as before.