Please answer these questions .a,b,c and d are the options . Please show me how to do the sums step by step . I will mark your answer BRAINLIEST.
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Please answer these questions .a,b,c and d are the options . Please show me how to do the sums step by step . I will mark your answer BRAINLIEST.
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1.
To Find:
Quadratic equation among given equation.
Solution:
We know that,
Those polynomials can be called quadratic in which highest degree or power of x is 2. x² must be present in the equation.
Now, in the given equations
On simplifying all the equations, we came to know that only equation (b) is the quadratic equation because highest power of x is 2 here
While in (a)- Highest power of x is 3
While in (c)- Highest power of x is 4
While in (d)- Highest power of x is 3
Hence, (b) is the correct answer
2. Correct Question:
Value of x for the equation is:
Given:
A quadratic equation
To Find:
Value of x
Solution:
Hence, the correct answer is (a)
3. Correct Question:
Which of the following have rational roots
a) 2x²+x-1=0
b) x²+x+1=0
c) x²-6x+6=0
d) 2x²+15x+30=0
To Find:
Quadratic equation having rational roots among given equations
Solution:
We know that,
Now, in the equation (a)
Discriminant= (1)² -4(2)(-1)= 9
And 9 is a square of 3
Hence, (a) is the correct answer
4.
Given:
An equation
To Find:
Solution:
Hence, the value of x is 1.
5.
Given:
A quadratic equation
To Find:
Solution of given equation by factorisation
Solution:
Hence, the correct answer is option (a).
Verified answer
All of your five questions are solved in 3 pages...have a look...!!!