Question

factorise 3 X square + X - 45​

Answer 1

Answer:

3x^2+x−45

Step-by-step explanation:

The first term is,  3x2  its coefficient is  3 .

The middle term is,  +x  its coefficient is  1 .

The last term, "the constant", is  -45  

Step-1 : Multiply the coefficient of the first term by the constant   3 • -45 = -135  

Step-2 : Find two factors of  -135  whose sum equals the coefficient of the middle term, which is   1 .

-135    +    1    =    -134  

-45    +    3    =    -42  

 -27    +    5    =    -22  

 -15    +    9    =    -6  

-9    +    15    =    6  

 -5    +    27    =    22  

 -3    +    45    =    42  

  -1    +    135    =    134  

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