1. The value of under root 12 under root 12 under root is
a) 3
b) 4
c) 12
d) 7
2. Find the value of k for which the equation x(square) + k(4x + k - 1) + 2 = 0 has real and equal roots.
3. If the product of two consecutive positive even integers is 120 then the sum of the integers is a) 32
b) 12
c) 22
d) 42
4. The height of a right triangle is 7 cm less than its base. If the hypotenuse is 13 cm the quadratic equation to find the base of the triangle, is
Please Answer Fast!
Answers
Answered by
3
Answer:
x
2
−4x+k=0 is of the form ax
2
+bx+c=0 where a=1b=−4c=k
Roots are equal⇒ Discriminant=0
⇒b
2
−4ac=0
⇒(−4)
2
−4×1×k=0
⇒16−4k=0
⇒−4k=−16
∴k=
4
16
=4
Step-by-step explanation:
Similar questions