In a test, correct answers carry +3 marks and wrong answers carry -1 marks. Ramesh answered all the questions. He scored 79 marks, though he maked 5 mistakes. Find the number of correct answers?

Step-by-step explanation:

let wrong answers be y

let right answer be x

3x-1y=79

find another equation

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

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step-by-step explanation:

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