Question

( x + 30 ) ( x + 40 )


solve for x

Answer 1

Explanation:

(x+30)(x+40)

X(x+40) +30(X+40)

X²+40x+30x+1200

X²+70x+1200

by applaying quadrtic fromula we get

a=1, b=70, c=1200

(-b ± √(b2 − 4ac))/(2a)

put the values

(-70±√(70)²-4(1)(1200)/2(1)

(-70±√4900-4800)/2

(-70±√100)/2

(-70±10)/2

either or

-70+10/2 -70-10/2

-60/2 -80/2

-30 -40

so x={-30,-40}

Answer 2

X^2 + 70x + 12000

Explanation:

Is that what you wanted? I got that by using the distributive method.