Question

3x²+3x=1260
What is the solution​

Answer 1

Step-by-step explanation:

Since its a quadratic equation,

bring 1260 from RHS to LHS

3x²+3x-1260=0

x²+x-420=0 (// dividing by 3)

x²-20x+21x-420=0 (//splitting the middle term)

x(x-20)+21(x-20)=0

(x+21) (x-20)=0

Since we have 2 values of x we will be writing both.

therefore, x= -21 or x= 20

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Answer 2

Answer:

20&21

Step-by-step explanation:

This can be written as x^2 + x=420 when divided by 3 throughout.

Then,

X(1+x)=420

Just rationalise 420 and find 2 possible values such that we obtain in the form of x and x+1

i. e, 420=2*2*3*5*7

3*7 and 2*2*5 form 20*21, same as x(x+1) form.

Therefore 20 and 21 are the values of x

Otherwise find the discriminant and apply the equation to find x

Hope this helps