Question

m²+17mn-84n²...Solve by ising quadratic formula. please answer fast..i will amrk you as brainliest ​

Answer 1

Step-by-step explanation:

${m}^{2} + 17mn - 84 {n}^{2} \\ = {m}^{2} + 21mn - 4mn - 84 {n}^{2} \\ = m(m + 21n) - 4n(m + 21n) \\ = (m + 21n)(m - 4n)$

Answer 2

Answer:

4, -21

Step-by-step explanation:

Quadratic formula = (-b±√(b²-4ac))/(2a)

Hence, a = 1, b = 17, c = -84

substituting in the given equation

(i) (-17 + √625)/2

= (-17 + 25)/2

= 4

(ii) (-17 - √625)/2

= (-17 - 25)/2

= -21

we get the values as 4, -21