Answer:
-7, -9
Explanation:
Assume Equation;
X² - SX + P =0
Where S= sum and P= product.
From question S=-16 and P=63
Equation then becomes;
X²-(-16)+63=0
X²+16+63=0
Using Factorisation method,
X²+7X+9X+63=0
Factorising,
(X²+7X) +(9X+63)=0
Taking common terms,
X(X+7)+9(X+7) =0
(X+9) and (X+7)
X+9=0 and
X+7=0
Therefore ;
X=-9 and X= -7