Question

(a+7) (a-5) give step by step answer​

Answer 1

• We have to evaluate the above expression by using the given data.

          Given data:-$(a+7)(a-5).$

          To find:- Value of the expression.

          Solution:-

• We know that factorization means reducing any algebraic or quadratic equation.

• Steps to solve quadratic equations,

• Step 1: Rearrange the given quadratic so that is it equal to zero.

• Step 2: Factorise the quadratic.

• Step 3: Form two linear equations.

• Step 4: Solve the equations to find the roots of the equation.

       Therefore,

        $=>(a+7)(a-5) \\=>a(a-5)+7(a-5)\\=>a^{2}-5 a+7(a-5) \\=>a^{2}-5 a+7 a-35\\=>a^{2}+2 a-35$

     Hence we will get $(a+7)(a-5)=a^{2}+2 a-35.$

Answer 2

As  per the given data in the question

In above question it is given that ,

We have find the value of given expression ,

As the given equation is in form of

So, for finding the value of the expression we will first multiply "a" with "c" and "d" and then multiply "b" with "c" and "d", and then add the resultant value.

So, value of expression we will be

So, applying the above condition in given question,

We will get,

$=(a+7)(a-5)\\=a^{2} +7a-5a-35\\=a^{2} +2a-35$

Hence the required value will be $(a+7)(a-5)=a^{2} +2a-35$.