Answer:
f² = -3 , 4² =7
Step-by-step explanation:
f2-4f =21
move constant to the left
f²- 4f -21 =0
write as a difference
f² + 3f - 7f -21 =0
factor the expressions
fx (f+3) -7 (f+3)=0
(f+3) x (f-7)=0
split into possible cases
f+3 = 0
f-7= 0
solve the equations
f = - 3
f = 7
THE FINAL SOLUTIONS ARE:
f1 = - 3 , 4² = 7
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Answer:
f² = -3 , 4² =7
Step-by-step explanation:
f2-4f =21
move constant to the left
f²- 4f -21 =0
write as a difference
f² + 3f - 7f -21 =0
factor the expressions
fx (f+3) -7 (f+3)=0
factor the expressions
(f+3) x (f-7)=0
split into possible cases
f+3 = 0
f-7= 0
solve the equations
f = - 3
f = 7
THE FINAL SOLUTIONS ARE:
f1 = - 3 , 4² = 7