-Q.5
Which of the following quadratic equations have x=3 as one of its roots.
(A) x - 8x +15=0
(B) x +8x +15=0
(C) X-8x – 15=0
(D) x'+8x –15=0
Answers
Answered by
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Question
Which of the following quadratic equations have x=3 as one of its roots.
(A) x - 8x +15=0
(B) x +8x +15=0
(C) X-8x – 15=0
(D) x'+8x –15=0
Answer
Given↓
(A) x - 8x +15=0
(B) x +8x +15=0
(C) X-8x – 15=0
(D) x'+8x –15=0
(A) x - 8x +15=0
If x = 3
→x - 8x +15=0
→x - 8x +15=0
→7×3= 15
→21 = 15
→21 - 15 ≠ 0
(B) x +8x +15=0
If x = 3
→9x = -15
→9×3 = -15
→27 = -15
→27 + 15 ≠ 0
(C) x-8x – 15=0
If x = 3
→-7x = 15
→-7×3 = 15
→-21 = 15
-21-15 ≠ 0
(D) x+8x –15=0
If x = 3
→9x = 15
→9×3. = 15
→27 = 15
→27-15 ≠0
As proved above, none of the quadratic equations have x=3 as its roots
Seafairy:
perfect answer :)
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