if x+2 is a factor of x²+ax+2b and a+b=4 then what is a and b?
Answers
Answered by
81
x=-2
4+a×-2+2b
4+-2a+3b
a=4-b
4+-2×4-b+3b
b=4
and a=o
if correct mark it as brainlyest
4+a×-2+2b
4+-2a+3b
a=4-b
4+-2×4-b+3b
b=4
and a=o
if correct mark it as brainlyest
heerabala:
it is wrong
Answered by
176
X+2 =0
X= -2
put in eq
(-2)^2+a(-2)+2b=0
4-4a+2b=0
-4a+2b=-4
-2(2a-b)=-4
a-b=2.....eq1
a+b=4...eq2
eq1+2
2a=6
a=3
now,
a+b=4
3+b=4
b=1
X= -2
put in eq
(-2)^2+a(-2)+2b=0
4-4a+2b=0
-4a+2b=-4
-2(2a-b)=-4
a-b=2.....eq1
a+b=4...eq2
eq1+2
2a=6
a=3
now,
a+b=4
3+b=4
b=1
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