$$(5 \sqrt{ 9 } -4 \sqrt{ 16 } )(5 \sqrt{ 25 } -6 \sqrt{ 36 }$$
$11$
$$\left(5\times 3-4\sqrt{16}\right)\left(5\sqrt{25}-6\sqrt{36}\right)$$
$$\left(15-4\sqrt{16}\right)\left(5\sqrt{25}-6\sqrt{36}\right)$$
$$\left(15-4\times 4\right)\left(5\sqrt{25}-6\sqrt{36}\right)$$
$$\left(15-16\right)\left(5\sqrt{25}-6\sqrt{36}\right)$$
$$-\left(5\sqrt{25}-6\sqrt{36}\right)$$
$$-\left(5\times 5-6\sqrt{36}\right)$$
$$-\left(25-6\sqrt{36}\right)$$
$$-\left(25-6\times 6\right)$$
$$-\left(25-36\right)$$
$$-\left(-11\right)$$
$$11$$
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