Question

Solved Examples 22
(1) Decide which of the following are quadratic equations ?
(1) 3x - 5x + 3 = 0 (2) 9y2 +5= 0 (3) m - 5m2 + 4 = 0 (4) (1 + 2) (1 - 5) = 0​

Answer 1

Answer:

it's second option 9y²+5+0

Answer 2

Answer:

answer is 3

i) 3x - 5x + 3 = 0

- 2x + 3= 0

This is not a quadratic equation

ii) 9y ^2 + 5 = 0

it in not in the form of

ax + by + c = 0

it is not a quadractic equation

iii) m - 5m^2 + 4= 0

-5m ^2 + m + 4 = 0

yes, it is the quadractic equation

iv) (1 - 2 )( 1- 5) = 0

no it is not a quadratic equation