\frac{x^2+5x+4}{3x+15}\cdot \frac{x^2+12x+35}{x^2+8x+7}\div \frac{x+4}{-2x} 3x+15 x 2 +5x+4 ​ ⋅ x 2 +8x+7 x 2 +12x+35 ​ ÷ −2x x+4 ​

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b

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step-by-step explanation: