Q. 1 B4.7( 6 Votes )

# Write number like this:

Explain why this is so, using algebra.

Answer :

Let the first number in the square be x, the others can be filled in as below,

Diagonal products: x (x+6) = x^{2} + 6x

(x+5)(x+1) = x(x+1) + 5(x+1) = (x^{2} + x) + (5x +5) = x^{2} + 6x + 5

Clearly, the difference between the two diagonal products is always 5.

Rate this question :

Write number like this:

As in the calendar; mark four numbers in a square and find the difference of diagonal products. Is it the same for all squares of four numbers?

Kerala Board Mathematics Part IIn the multiplication table made earlier, take a square of nine numbers, instead of four, and mark the numbers at the four corners:

What if we take a square of sixteen numbers?

Kerala Board Mathematics Part IWrite number like this:

Instead of a square of four numbers, take a square of nine numbers and mark only the numbers at the four corners.

What is the difference of diagonal products? Explain using algebra.

Kerala Board Mathematics Part IWrite number like this:

As in the calendar; mark four numbers in a square and find the difference of diagonal products. Is it the same for all squares of four numbers?

Kerala Board Mathematics Part IWrite number like this:

Instead of a square of four numbers, take a square of nine numbers and mark only the numbers at the four corners.

What is the difference of diagonal products? Explain using algebra.

Kerala Board Mathematics Part IWrite number like this:

Explain why this is so, using algebra.

Kerala Board Mathematics Part I