If one zero of the quadratic polynomial x2 + 3x + k is –5, then find the value of k.
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3
Answer:
Given that 2 is a zero of equation x
2
+3x+k=0, thus will satisfy the equation.
2
2
+3×2+k=0
⇒k=−4−6=−10
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Given that2is a zero of equation
x 2
3x+
k=
0
, thus will satisfy the equation.
2 2
3× 2+ k= 0
⇒ k= −4− 6= −10
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